Company email (November 2014):
"We are not currently using any animal products to produce our beer. We haven't used isinglass for at least six months."

Note from Keith (November 2013):
"I was just recently informed by a brewer at Green Flash that ALL of their beers currently use isinglass. They will be upgrading to a centrifuge eventually and leaving all finings behind, but as of now... not vegan."